Carburetor



C. L. RAYFIELD.v

CARBURETOR.

APPLICATION FILED DEC.16, 19 16.

1,412,259, Patented Apr. 11, 1922.

3 SHEETS-SHEET I.

C. 'L. RAYFIELD.

CARBURETOR.

APPLICATION FILED DEC. 16. 1916.

1,412,259. Patented Apr. '11, 1922.

3 SHEETS-SHEET 2.

C. L. RAYFIELD.

CARBURETOR.

APPLICATION FILED DEC. 16. 1916.

1,412,259. Patented A1111 11, 1922.

3 SHEETS-SHEET 3. 11 .9

omrao' mares Pa E o Free.

.cI ARLEs L. RAYFIELD, or 'cIIIcAGo, ILLINOIS, ASSIGNOR T0 13mm & xnorr MANU- racrunmo COMPANY, or CHICAGO, ILLINOIS, a CORPORATION or ILLINOIS.

I Specification of Letters llatent. Patented Apr. 11, 19-22a CARIBURETOR.

A Application filed December 16. 1916. Serial No. 137,373.

To-all'whom itmay concern:

Be it known that I, CHARLES L. RAYFIELD,

a citizen of the United States, and a resident of the city of Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in a Carburetor; and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanying drawings, and to the numeralsi of reference marked thereon, which form a part of this specificationf This invention relates to an improved type of carburetor wherein means .are provided forintroducing raw-fuel into the manifold of the engine; from the carburetor irrespec tive of the adjustment of the throttle valve. The liquid fuel is supplied from the carburetor through openings at the pivotal connection of the throttle valve whereby under sudden suction drafts through the carburetor, fuel is pumped'to an auxiliary reser voir -and drawn'therefroingdue to the suction,

into the carburetor, while under normal operating condit ons-sand means'serves only to draw a slight amount of .air therethrough carbure'ted to some extent by the fuel.

the level'of fuel to'the auxiliary reservoir- -permit's fuel to be drawnthrough a b'y-pa'ss. communicating with said reservoir and the.

' It is an object therefore of this invention to construct aca'rburetor wherem means are provided operating normally to permit a. slight flow of slightly earbureted air into the carburetor mixture flowing from the carburetor into the engine.

It is also an object of this invention to construct acarburetor provided with a float chamber and a 'mixing chamber together with an auxiliary inlet valve serving to operate a piston in a dash pot chamber to pump fuel into an auxiliary vented reser voir slightly above the normal level of fuel in the floatchamber so that an elevation of mixing chamber of thecarburetor at the K throttle valve to'enricli the mixture-'leav ing the carburetor under sudden acceleration. effects imposed upon the. "carburetor by the en ine.

t is also an object of this invention}tocon struct a carburetor provided with-anauxiliary fuel dash potchamber with a piston therein operatable by-sudden .movement of the air valve, and with a fuel passage communicating with said dash pot chamber adapted to receive fuel pumped thereinto,

thereoff g A float'8,'ismoun ted'1n the, float chamber 1., and controls the inletoffuel to the" float by. movement of said piston, and leading into the pivotal nountmg of the throttle valve of the carburetor to spray the fuel into the mixing chamber of the carburetor to enrich the mixture leaving the same;

It is finally an object of this invention to embodying the principles of my invention.

Figure 2 is .a central vertical section taken 3.-.3 of Figure 2, with parts shown in elevation.

I Figure .4.is a detail section taken on'line;

4-4 of Figure 3.

Figure 5 is a detail section taken on line 5 .5 ofFigure-Q, with parts shown in elevation. t

Figure 6 is a detail section taken on line 66 of Figure 5.

Figure 7 's a reduced top' plan-view of the carburetor.

As showmin the drawings: I The carburetor casing consists-of a float chamber 1, and a mixing chamber 2, with the metal of the carburetor casing cored outto form an inlet passage, for airand'fuel at one side of the "mixingchamber denoted by the reference numeral -3.f Said passage. is

formed-between the float chamber and the 1 mixing chamber, and with an extension of the fuel float chamber therebeneath entirely filled with fuel and. denoted bythe reference 1 ther'ethroug'h with parts shown in elevation. I i

, Figure 3is a detail sect on taken online' parts omitted and numeral "4, fA supplementary casing mem- "I ber. 5', is securedatone side of the carburetor,. having-"an air inlet passage 6, there ':through,{ communicating laterally in "the p sidel'of the mixing chamber 2, opposite to" "said passage 3 and is provided with a dash 7,- formed at the lower end pot chamber chamber through 'aninl'etp'ipe 9', and

sages in. the lower. end of the float chamber 'ina well known manner, and. since the gietails of construction and operation form no part of this. invention, further: description tures or jets 14, through its hub communi upon theouter end of the pintle shaft 13,,

thereof isnot entered into. A fuel nozzle 10, is threaded into the casing partition wall between the chambers 3 and 4, to admit fuel from the chamber 4, 'into the air passage 3,.and a needle valve 11, is slidably mounted through the top wall of the passage 3, to control the flow of fuel through sa d nozzle. throttle valve 12, of the butterfly type, is pivotally mounted at the outlet of the mixing chamber 2, being secured upon a tubular shaft '13, with apercating with the interior of the pivot shaft 13, for a purpose hereinafter pointed out.

An actuating lever 15, is rigidly secured and connections are provided wherebythe needle valve 11, for the fuel nozzle 10, is operated [simultaneously with and in certain proportionate amounts with adjustment.

or movement of the throttle valve 12. For

. this purpose, a horizontal shaft 16, is pivoted on the casing of the carburetor, and is provided with a finger 17, engaging a notch in the needle valve 11, shown in Figure 2,

and the outer end of said shaft 16, carries.

a crank 18, one end of which is in contact with a cam 19, mounted upon thetubular throttle valve shaft 13,.whereby the shaft 16, is operated and the finger 17, swung upwardly to elevate the needle valve when the throttle valve 12, is moved toward open.

whichan air inlet valve closure 21, is secured, adapted'to seat against an annular seat member 22, threaded adjustably into the upper end of the casing 5, and with an apertured piston 23, secured upon the lower end of said stem movable within the dash pot chamber 7 A movable "disk closure 23 is slid'ably mounted beneath the piston? 23, adapted to close the apertures therein during downward movement of the pistonand to permit flow therethrou'gh-duringmp ward movements thereof. A spring 24, is coiled about .said'st em 20, bearing down-' wardly uponthe vtop surface of the top wall of the dash .pot chamber '7, and up- 'wardly beneath said valve 21,- to normally impel the same upwardly into closed relation with the annularv seat member 22. A yoke shaped arm 25, having a cylindrical extension 26, secured'beneath said valve 21,

is provided, which extends inwardly through the air inlet passage 6, into the. mixing chamber 2, and is there connected by means of a link 27,- toa butterfly valve 28, pro- 7 vided in an inlet air opening at the lower end of the mixing chamber 2.

-A pipe 29, leadsfrom the float chamber extension 4, to the dash pot chamber 7, communicating with passage-30, formed in one side thereof. which leads upwardly and communicates into the upper end of the dash pot chamber. Another pipe 31, communicates at one side with the lower end of said 'dash pot chamber, and leads upwardly to an auxiliary reservoir 32, on the exterior 'of the carburetor as shown in Figures 1 and 3. Said. auxiliary reservoir or chamber 32, I

is provided with an air vent 33, at the upper end thereof, and the lower endof said reservoir is slightly above the normal level of fuel in the float chamber. Another pipe 34, enters through the side wall near the lower end of the auxiliary reservoir 32, and leads upwardly into the hub on the carburetor casing through which the tubular throttle valve shaft 13, extends at a point at which passages 35, are formed throughsaid throt- 1 which controls the flow of fuel therefrom and which is actuatable downwardly into open position by contact with the under surface of the air valve 21, whereby the fuel nozzle is opened when'the airvalve 21, is

drawn inwardly by suction through the carburetor.

The operation is as follows:

The fuel supply to the carburetor enters through the inlet pipe 9, and the amount entering the carburetor-is controlled by the float 8, in a-usual andwell known manner to maintain the quantity of fuel in the carburetor substantially at a constant level. Under normal operating conditions of an engine, fuel is supplied through the fuel nozzle 10, in amounts determined by the adjustmentof the needle valve 11, air enteringthrough an open air port formed in the passage 3, adjacent said fuel nozzle. The port 35 in the throttle valve stem does not communicatawith the opening in the pipe 34, until thevalve 12, is partially opened, the arrangement shown requiring about a half way openinglof the valve before such communication is established, and under normal conditions; after such communication is established, merely air carburete'd to some extent, is drawn upwardly from the pipe 34, admitted through theair vent 33, of the auxiliary reservoir 32,'the 1evel of carburetor is exerted through the pipe. 34,-

fuel in the pipe 31, being the same as that iary reservoir 32, wherein the level rises' above the lower end of the pipe 34, communicating into the lower end of the reservoir. Due to the adjustment of the throt-.

tle valve shaft 13, as the throttle valve is thrown into wide open position, complete communication is established between the pipe 34, and the interior of the tubular throttle valve shaft so that the draft in the t9 draw the fluid upwardly from the auxil iary reservoir 32, spraying the fuel through the orifices 14, in the hub of the throttle valve.

This supply of liquid fuel into the mixture leaving the carburetor serves to enrich the mixture so that rapid acceleration of the engine even under load may take place. The depression of the piston 23, injects a supply of fuel" through the nozzle 36, into the air passage 6, of the carburetor, at the same time that the fuel is supplied tothe reservoir ,32, and if the throttle remains open, the

continuing draft through the carburetor will hold the air valve 21, open and the piston 23, depressed any fuel remaining in the reservoir 32, after'the initial'depression of the piston 23, will be gradually dissipated by the draft through the pipe 34, and the drainage back through the pipe 31, thus affording for'a limited time after the sudden opening of the valve 12, an enrichment of the mixture supplied by the carburetor so as to insure the engine picking up speed. If, after the sudden opening of the throttle 12, it is immediately returned to a less open position, the draft of air through the carburetor is diminished and the valve 21 and' It is evident that a sudden openingmof the throttle valvecauses the fuel to be supplied at three different points in the carburetor. The downward movement of the piston 23,

serves to force fuel from the dash pot up- \vardly and through the orifices of the t-hrot tle valve, as described, the downward movement of said automatic air valve 21, WhlCl]. operates the-piston serves to depress the metering pin 37, to open the auxiliary fuel nozzle 36, and the actuation of the throttle valve due to the interconnection thereof with the needle valve 11', serves to elevate the needle valve so that a greater supply of fluid is admitted as the throttle opens.

I am aware that various details of construction may be varied through a wide rangewithout departing from the principles of this invention, and I therefore do not purpose limiting the patent granted otherwise than necessitated by the prior art.

-I-claim as my invention.

1. In a carburetor ofthe class described,

a a float chamber, a mixing chamber, a throt tle valve in the mixing chamber, spray apertures in the throttle valve, a vented auxiliary fuel chamber connected with the fuel chamber and on a higher level than the normal level of fuel in the float chamber, an air valve operated mechanism for forcing fuel into the auxiliary .fuel chamber, and means connecting the throttle valve and the auxiliary chamber below the vent therein.

2. 'In a carburetor of the class'described,-a float chamber, a mixing chamber, a throttle valve for said mixing chamber having a plurality of spray apertures in its walls, a dashpot chamber connected with the float chamber, a piston therein, an air valve mechanism connecting the air valve and piston to move'together, an auxiliary fuel chamber connectedwith the dash-pot chamber and on a higher level than'the normal level of fuel in the float chamber, said fuel chamber. having an air aperture therein, and means affording communication between the throttle valve and the auxiliary chamber below the air aperture.

3. In a carburetor, the combination of a casing having a float feed chamber and an air passageway to which fuel is supplied from the float feed chamber, an auxiliary chamber extending above the level of the fuel'in the float chamber,-an automaticair valve adapted topump fuel from the float chamber to the auxiliary chamber, an outlet from the auxiliary chamber to the air passageway from a point in said, chamber above the level of the fuel in the .float chamher, and means for preventing increase in pressure in the auxiliary chamber so that the fuel is drawn through said outlet entirely by suction.

In testimony whereof I have hereunto subscribed my name in the presence of two subscribing witnesses.

CHARLES L. RAYFIELD.

Witnesses:

' CHARLES W. HILLS, J r., EARL M. HARDINE. 

